/* os_file.h : os file operation
 * CopyRight (C) 2008 dgnbbs
 * drangon_zhou@21cn.com
 * 2008-10
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef INCLUDED_OS_FILE_H
#define INCLUDED_OS_FILE_H

#include "os_common.h"

BEGIN_EXTERN_C_DECL

typedef int os_file_t;
#define OS_FILE_INVALID_HANDLE (-1)

os_file_t os_file_open( const char * fname );
int os_file_close( os_file_t fd );

int os_file_lock( os_file_t fd );
int os_file_unlock( os_file_t fd );

int os_file_read( os_file_t fd, int64_t offset, char * buf, int32_t len );
int os_file_write( os_file_t fd, int64_t offset, const char * buf, int32_t len );

END_EXTERN_C_DECL

#endif /* INCLUDED_OS_FILE_H */

